DS2180A Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2180A

T1 Transceiver

Dallas Semiconductor -> Maxim Integrated 

DS2180A

B8ZS

The DS2180A supports existing and emerging zero suppression formats. Selection of B8ZS coding

maintains system 1’s density requirements without disturbing data integrity as required in emerging clear

channel applications. B8ZS coding replaces eight consecutive outgoing 0's with a B8ZS code word. Any

received B8ZS code word is replaced with all 0’s. B8ZS and bit 7 stuffing modes should not be enabled

simultaneously. Enabling both results in LOS.

TCR: TRANSMIT CONTROL REGISTER Figure 5

(MSB)

ODF

TFPT

TCP

RBSE

TIS

193SI

(LSB)

TBL

TYEL

SYMBOL

ODF

TFPT

TCP

RBSE

TIS

193SI

TBL

TYEL

POSITION

TCR.7

TCR.6

TCR.5

TCR.4

TCR.3

TCR.2

TCR.1

TCR.0

NAME AND DESCRIPTION

Output Data Format.

0 = Bipolar data at TPOS and TNEG.

1 = NRZ data at TPOS; TNEG=0.

Transmit Framing Pass-through.

0 = FT/FPS sourced internally.

1 = FT/FPS sampled at TSER during F-bit time.

Transmit CRC Pass-through.

0 = Transmit CRC code internally generated.

1 = TSER sampled at CRC F-bit time for external CRC insertion.

Robbed Bit Signaling Enable.

1 = Signaling inserted in all channels during signaling frames.

0 = No signaling inserted. (The TTR registers allow the user to

disable signaling insertion on selected DS0 channels.)

Transmit Idle Code Select. Determines idle code format to be

inserted into channels marked by the TIR registers.

0 = Insert 7F (Hex) into marked channels.

1 = Insert FF (Hex) into marked channels.

193S S-bit Insertion. Determines source of transmitted S-bit.

0 = Internal S-bit generator.

1 = External (sampled at TLINK input).

Transmit Blue Alarm.

0 = Disabled.

1 = Enabled.

TYEL TCR.0 Transmit Yellow Alarm.

0 = Disabled.

1 = Enabled.

TRANSMIT BLUE ALARM

The blue alarm (also known as the AIS, Alarm Indication Signal) is an unframed, all 1’s sequence

enabled by asserting TCR.1. Blue alarm overrides all other transmit data patterns and is disabled by

clearing TCR.1. Use of the TIR registers allows a framed, all 1’s alarm transmission if required by the

network.

TRANSMIT YELLOW ALARM

In 193E framing, a yellow alarm is a repeating pattern set of FF(Hex) and 00 (Hex) on the 4 kHz facility

data link (FDL). In 193S framing the yellow alarm format is dependent on the state of bit CCR.3. In all

modes, yellow alarm is enabled by asserting TCR.0 and disabled by clearing TCR.0.

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